import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {
    private  Socket socket=null;
    public TcpEchoClient(String serverIp,int serverPort) throws IOException {
        //Socket构造方法，能够识别点分十进制格式的Ip地址，比DatagramPacket更方便
        //在new这个对象的时候，就开始进行TCP的连接操作了
        socket=new Socket(serverIp,serverPort);
    }

    public void start() {
        System.out.println("客户端启动");
        Scanner scanner=new Scanner(System.in);
        try(InputStream inputStream=socket.getInputStream();
            OutputStream outputStream=socket.getOutputStream()) {
            while(true){
                //1.先从键盘上读取用户输入的内容
                System.out.print(">");
                String request=scanner.next();
                if(request.equals("exit")){
                    System.out.println("GoodBye");
                    break;
                }
                //2.把读到的内容构造成请求，发给服务器
                PrintWriter printWriter=new PrintWriter(outputStream);
                printWriter.println(request);
                printWriter.flush();
                //3.读取服务器的响应
                Scanner respScanner=new Scanner(inputStream);
                String response=respScanner.next();
                //4.把响应内容显示到界面上
                System.out.println(response);
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient client=new TcpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
